These pages contain Shockwave Flash films (SWF) with some simple effects, which is 'active content', that may be automatically blocked by some Internet browsers, because it comes from an 'unknown source'. If you are not seeing the films correctly and not hearing the music (which is also in Flash format) and a 'warning text line' has appeared directly above the window, you should click on it and select to 'allow the active content'.If you find that each page is blocked as you open it, you will need to click on the warning line again and 'allow'..